VintaSoft Twain .NET SDK 14.0: Documentation for .NET developer
In This Topic
    How to scan pages from the automatic document feeder (ADF) of TWAIN scanner?
    In This Topic
    DocumentFeeder class allows to control the document feeder of the device.


    Here is an example that demonstrates how to use document feeder of the device:
    /// <summary>
    /// Acquire images from the document feeder.
    /// </summary>
    public void AcquireImagesFromAdf(Vintasoft.Twain.Device device)
    {
        // disable UI
        device.ShowUI = false;
    
        // open the device
        device.Open();
        // specify that color images must be acquired
        device.PixelType = Vintasoft.Twain.PixelType.RGB;
        // set the inches as unit of measure
        device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches;
        // set the desired resolution of acquired images
        device.Resolution = new Vintasoft.Twain.Resolution(200f, 200f);
    
        // if device has feeder
        if (device.HasFeeder)
        {
            // enable feeder
            device.DocumentFeeder.Enabled = true;
            // specify that application want to acquire all pages from the feeder
            device.XferCount = -1;
    
            // if pages can be scanned in duplex mode
            if (device.DocumentFeeder.DuplexMode != Vintasoft.Twain.DuplexMode.None)
                // enable duplex scanning
                device.DocumentFeeder.DuplexEnabled = true;
    
            // if feeder can detect paper
            if (device.DocumentFeeder.PaperDetectable)
            {
                // if feeder is loaded
                if (device.DocumentFeeder.Loaded)
                    // acquire images asynchronously
                    device.Acquire();
            }
            // if feeder cannot detect paper
            else
                // acquire images asynchronously
                device.Acquire();
        }
    }
    
    ''' <summary>
    ''' Acquire images from the document feeder.
    ''' </summary>
    Public Sub AcquireImagesFromAdf(ByVal device As Vintasoft.Twain.Device)
        ' disable UI
        device.ShowUI = False
    
        ' open the device
        device.Open()
        ' specify that color images must be acquired
        device.PixelType = Vintasoft.Twain.PixelType.RGB
        ' set the inches as unit of measure
        device.UnitOfMeasure = Vintasoft.Twain.UnitOfMeasure.Inches
        ' set the desired resolution of acquired images
        device.Resolution = New Vintasoft.Twain.Resolution(200.0F, 200.0F)
    
        ' if device has feeder
        If device.HasFeeder Then
            ' enable feeder
            device.DocumentFeeder.Enabled = True
            ' specify that application want to acquire all pages from the feeder
            device.XferCount = -1
    
            ' if pages can be scanned in duplex mode
            If device.DocumentFeeder.DuplexMode <> Vintasoft.Twain.DuplexMode.None Then
                ' enable duplex scanning
                device.DocumentFeeder.DuplexEnabled = True
            End If
    
            ' if feeder can detect paper
            If device.DocumentFeeder.PaperDetectable Then
                ' if feeder is loaded
                If device.DocumentFeeder.Loaded Then
                    ' acquire images asynchronously
                    device.Acquire()
                End If
            Else
                ' if feeder cannot detect paper
                ' acquire images asynchronously
                device.Acquire()
            End If
        End If
    End Sub